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https://www.readbyqxmd.com/read/29054109/influence-of-backside-loading-on-the-floating-mass-transducer-an-in-vitro-experimental-study
#1
Antoniu-Oreste Gostian, Martin Sylvester Otte, David Pazen, Magdalene Ortmann, David Schwarz, Karl Bernd Hüttenbrink, Dirk Beutner
HYPOTHESIS: The vibration of the floating mass transducer (FMT) of a single active middle-ear implant (AMEI) is distinctly influenced by the properties of the material coupled to its back side. BACKGROUND: In round window vibroplasty, the FMT needs to be padded against the surrounding bone opposite from the round window membrane. This represents one factor influencing its performance as a round window driver. Therefore, we examined the effects of different materials linked to the back side of an FMT on its vibration range...
October 20, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/29053725/the-effects-of-training-with-loads-that-maximise-power-output-and-individualised-repetitions-vs-traditional-power-training
#2
J M Sarabia, M Moya-Ramón, J L Hernández-Davó, J Fernandez-Fernandez, R Sabido
BACKGROUND: It has been suggested that strength training effects (i.e. neural or structural) vary, depending on the total repetitions performed and velocity loss in each training set. PURPOSE: The aim of this study is to compare the effects of two training programmes (i.e. one with loads that maximise power output and individualised repetitions, and the other following traditional power training). METHODS: Twenty-five males were divided into three groups (optimum power [OP = 10], traditional training [TT = 9] and control group [CG = 6])...
2017: PloS One
https://www.readbyqxmd.com/read/29053285/upper-bound-on-diffusivity
#3
Thomas Hartman, Sean A Hartnoll, Raghu Mahajan
The linear growth of operators in local quantum systems leads to an effective light cone even if the system is nonrelativistic. We show that the consistency of diffusive transport with this light cone places an upper bound on the diffusivity: D≲v^{2}τ_{eq}. The operator growth velocity v defines the light cone, and τ_{eq} is the local equilibration time scale, beyond which the dynamics of conserved densities is diffusive. We verify that the bound is obeyed in various weakly and strongly interacting theories...
October 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29053083/surgical-management-of-penetrating-spinal-cord-injury-primarily-due-to-shrapnel-and-its-effect-on-neurological-outcome-a-literature-review-and-meta-analysis
#4
Michael H Lawless, Evan J Lytle, Andrea F McGlynn, John A Engler
OBJECTIVE This study was performed to determine whether decompression of penetrating spinal cord injury (SCI) due to explosive shrapnel leads to greater neurological recovery than conservative management. METHODS In accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, a comprehensive literature search using PubMed/MEDLINE, Web of Science, Google Scholar, and the Defense Technical Information Center public site was conducted on May 2, 2016. Studies that described penetrating SCI with shrapnel as an etiology, included surgical and/or conservative management, and demonstrated admission and follow-up neurological status were eligible for inclusion in this study...
October 20, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29053076/protective-effect-of-biodegradable-nerve-conduit-against-peripheral-nerve-adhesion-after-neurolysis
#5
Kosuke Shintani, Takuya Uemura, Kiyohito Takamatsu, Takuya Yokoi, Ema Onode, Mitsuhiro Okada, Hiroaki Nakamura
OBJECTIVE Peripheral nerve adhesion caused by extraneural and intraneural scar formation after neurolysis leads to nerve dysfunction. The authors previously developed a novel very flexible biodegradable nerve conduit composed of poly(L-lactide) and poly(ε-caprolactone) for use in peripheral nerve regeneration. In the present study, they investigated the effect of protective nerve wrapping on preventing adhesion in a rat sciatic nerve adhesion model. METHODS Rat sciatic nerves were randomly assigned to one of the following four groups: a no-adhesion group, which involved neurolysis alone without an adhesion procedure; an adhesion group, in which the adhesion procedure was performed after neurolysis, but no treatment was subsequently administered; a nerve wrap group, in which the adhesion procedure was performed after neurolysis and protective nerve wrapping was then performed with the nerve conduit; and a hyaluronic acid (HA) group, in which the adhesion procedure was performed after neurolysis and nerve wrapping was then performed with a 1% sodium HA viscous solution...
October 20, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29052801/coronary-flow-response-to-remote-ischemic-preconditioning-is-preserved-in-old-cardiac-patients
#6
Elpidio Santillo, Monica Migale, Fabrizio Balestrini, Demetrio Postacchini, Silvia Bustacchini, Fabrizia Lattanzio, Raffaele Antonelli-Incalzi
BACKGROUND: The effect of remote ischemic preconditioning (RIPC) on coronary flow in elderly cardiac patients has not been investigated yet. Thus, we aimed to study the change of coronary flow subsequent to RIPC in old patients with heart diseases and to identify its main correlates. METHODS: Ninety-five elderly patients (aged ≥ 65 years) accessing cardiac rehabilitation ward underwent transthoracic ultrasound evaluation of peak diastolic flow velocity of left anterior descending artery...
October 20, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/29052519/circuit-training-enhances-function-in-patients-undergoing-total-knee-arthroplasty-a-retrospective-cohort-study
#7
Wei-Hsiu Hsu, Wei-Bin Hsu, Wun-Jer Shen, Zin-Rong Lin, Shr-Hsin Chang, Robert Wen-Wei Hsu
BACKGROUND: The number of patients receiving total knee arthroplasty (TKA) has been rising every year due to the aging population and the obesity epidemic. Post-operative rehabilitation is important for the outcome of TKA. METHODS: A series of 34 patients who underwent primary unilateral TKA was retrospectively collected and divided into either exercise group (n = 16) and control group (n = 18). The exercise group underwent a 24-week course of circuit training beginning 3 months after total knee arthroplasty (TKA)...
October 19, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29051869/case-of-acute-concomitant-rupture-of-anterior-cruciate-ligament-and-patellar-tendon-of-knee-surgical-decision-making-and-outcome
#8
Jithin Orville Lobo, Joe Joseph Cherian, Arnav Sahu
INTRODUCTION: Acute concomitant rupture of both anterior cruciate ligament (ACL) and patellar tendon is a rare injury. The diagnosis of either of the injuries may be missed on clinical examination in the emergency room. A high index of suspicion is necessary when active extension is absent, and necessary investigations like ultrasound or magnetic resonance imaging (MRI) should be done to confirm the diagnosis. There are no fixed treatment protocols in these injuries. The options include immediate repair of patellar tendon with either simultaneous or delayed reconstruction of ACL...
May 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/29051631/acoustic-streaming-an-arbitrary-lagrangian-eulerian-perspective
#9
Nitesh Nama, Tony Jun Huang, Francesco Costanzo
We analyse acoustic streaming flows using an arbitrary Lagrangian Eulerian (ALE) perspective. The formulation stems from an explicit separation of time scales resulting in two subproblems: a first-order problem, formulated in terms of the fluid displacement at the fast scale, and a second-order problem, formulated in terms of the Lagrangian flow velocity at the slow time scale. Following a rigorous time-averaging procedure, the second-order problem is shown to be intrinsically steady, and with exact boundary conditions at the oscillating walls...
August 25, 2017: Journal of Fluid Mechanics
https://www.readbyqxmd.com/read/29051619/person-identification-from-aerial-footage-by-a-remote-controlled-drone
#10
Markus Bindemann, Matthew C Fysh, Sophie S K Sage, Kristina Douglas, Hannah M Tummon
Remote-controlled aerial drones (or unmanned aerial vehicles; UAVs) are employed for surveillance by the military and police, which suggests that drone-captured footage might provide sufficient information for person identification. This study demonstrates that person identification from drone-captured images is poor when targets are unfamiliar (Experiment 1), when targets are familiar and the number of possible identities is restricted by context (Experiment 2), and when moving footage is employed (Experiment 3)...
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29051535/the-biomechanical-origin-of-extreme-wing-allometry-in-hummingbirds
#11
Dimitri A Skandalis, Paolo S Segre, Joseph W Bahlman, Derrick J E Groom, Kenneth C Welch, Christopher C Witt, Jimmy A McGuire, Robert Dudley, David Lentink, Douglas L Altshuler
Flying animals of different masses vary widely in body proportions, but the functional implications of this variation are often unclear. We address this ambiguity by developing an integrative allometric approach, which we apply here to hummingbirds to examine how the physical environment, wing morphology and stroke kinematics have contributed to the evolution of their highly specialised flight. Surprisingly, hummingbirds maintain constant wing velocity despite an order of magnitude variation in body weight; increased weight is supported solely through disproportionate increases in wing area...
October 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/29051378/quantum-control-of-molecular-collisions-at-1-kelvin
#12
William E Perreault, Nandini Mukherjee, Richard N Zare
Measurement of vector correlations in molecular scattering is an indispensable tool for mapping out interaction potentials. In a coexpanded supersonic beam, we have studied the rotationally inelastic process wherein deuterium hydride (HD) (v = 1, j = 2) collides with molecular deuterium (D2) to form HD (v = 1, j = 1), where v and j are the vibrational and rotational quantum numbers, respectively. HD (v = 1, j = 2) was prepared by Stark-induced adiabatic Raman passage, with its bond axis aligned preferentially parallel or perpendicular to the lab-fixed relative velocity...
October 20, 2017: Science
https://www.readbyqxmd.com/read/29051335/coronary-capillary-blood-flow-in-a-rat-model-of-congestive-heart-failure
#13
Heather J Kagan, Varujan D Belekdanian, Jiqiu Chen, Peter Backeris, Nadjib Hammoudi, Irene C Turnbull, Kevin D Costa, Roger J Hajjar
The aim of this study is to explore the role of abnormal coronary microvasculature morphology and hemodynamics in the development of congestive heart failure (CHF). METHODS: CHF was induced in rats by aortic banding, followed by ischemia/reperfusion and later aortic debanding. Polymerized casts of coronary vasculature were imaged under a Scanning Electron Microscope (SEM). Matrix Laboratory (MATLAB) software was used to calculate Capillary Structure Index (CSI), a measure of structural alignment also called Mean Vector Length (MVL), for 93 SEM images of coronary capillaries (CSI→ 1 perfect linearity, CSI→ 0 circular disarray)...
October 19, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29050851/validation-of-a-new-device-to-quantify-groundwater-surface-water-exchange
#14
Mackenzie M Cremeans, J F Devlin
Distributions of flow across the groundwater-surface water interface should be expected to be as complex as the geologic deposits associated with stream or lake beds and their underlying aquifers. In these environments, the conventional Darcy-based method of characterizing flow systems (near streams) has significant limitations, including reliance on parameters with high uncertainties (e.g., hydraulic conductivity), the common use of drilled wells in the case of streambank investigations, and potentially lengthy measurement times for aquifer characterization and water level measurements...
August 10, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/29050824/in-vivo-repeatability-of-the-pulse-wave-inverse-problem-in-human-carotid-arteries
#15
Matthew McGarry, Pierre Nauleau, Iason Apostolakis, Elisa Konofagou
Accurate arterial stiffness measurement would improve diagnosis and monitoring for many diseases. Atherosclerotic plaques and aneurysms are expected to involve focal changes in vessel wall properties; therefore, a method to image the stiffness variation would be a valuable clinical tool. The pulse wave inverse problem (PWIP) fits unknown parameters from a computational model of arterial pulse wave propagation to ultrasound-based measurements of vessel wall displacements by minimizing the difference between the model and measured displacements...
September 27, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29050524/transcranial-doppler-systolic-flow-index-and-icp-derived-cerebrovascular-reactivity-indices-in-tbi
#16
Frederick Adam Zeiler, Danilo Cardim, Joseph Donnelly, David Menon, Marek Czosnyka, Peter Smieleweski
To explore relationships between transcranial Doppler (TCD) indices of cerebrovascular reactivity and those derived from intracranial pressure (ICP). GOALS: A. Confirm previously described co-variance patterns of TCD/ICP indices, and B. Describe thresholds for Sx (correlation between systolic flow velocity (FVs) and cerebral perfusion pressure (CPP)) associated with outcome. Retrospective cohort of traumatic brain injury (TBI) patients: with TCD and ICP monitoring, we calculated various continuous indices of cerebrovascular reactivity: A...
October 19, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29050419/successful-chilling-of-red-legged-partridge-alectoris-rufa-sperm-for-use-in-artificial-insemination
#17
J Santiago-Moreno, C Castaño, A Toledano-Díaz, M C Esteso, A López-Sebastián, S Villaverde-Morcillo, S G Dávila, M G Gil, E Blesbois
The fertilizing capacity of pure, fresh avian semen may disappear in just half an hour, hindering its successful use in artificial insemination (AI) projects. Longer storage requires the use of infra-physiological temperatures and of semen diluents that help preserve the spermatozoa but that do not interfere with their fertilizing capacity. This study examines the effect on sperm quality of storing red-legged partridge sperm for 3 h at 5°C with 2 different semen extenders: 1) a medium referred to as L&R-84, composed of sodium glutamate, glucose, magnesium acetate, potassium acetate, and polyvinylpyrrolidone, and 2) Lake 7...
September 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/29050262/longitudinal-rotation-a-new-way-to-detect-the-cardiotoxicity-of-anthracycline-based-chemotherapy-in-breast-cancer-patients
#18
Jun Huang, Zi-Ning Yan, Yi-Fei Rui, Dan Shen, Li Fan, Dong-Liang Chen
BACKGROUND AND AIMS: The study was to compare cardiac parameters before and after anthracycline-based chemotherapy and identify a parameter for detecting cardiotoxicity in breast cancer patients. METHODS: Cardiac function in 43 female breast cancer patients was evaluated at three time points: baseline, 1-3 days before the initiation of anthracycline-based chemotherapy; 3 weeks and 6 months after the final cycle of chemotherapy. At each visit, the peak longitudinal velocity; strain rate; peak systolic strain; peak systolic longitudinal displacement, and segmental and global longitudinal rotation degrees of the left ventricular were measured...
September 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29050041/lower-limb-force-velocity-power-capabilities-during-leg-press-and-squat-movements
#19
Johnny Padulo, Gian Mario Migliaccio, Luca Paolo Ardigò, Bruno Leban, Marco Cosso, Pierre Samozino
The aim was to compare lower-limb power, force, and velocity capabilities between squat and leg press movements. Ten healthy sportsmen performed ballistic lower-limb push-offs against 5-to-12 different loads during both the squat and leg press. Individual linear force-velocity and polynomial power-velocity relationships were determined for both movements from push-off mean force and velocity measured continuously with a pressure sensor and linear encoder. Maximal power output, theoretical maximal force and velocity, force-velocity profile and optimal velocity were computed...
October 19, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29049969/the-role-of-hydrodynamics-in-shaping-the-composition-and-architecture-of-epilithic-biofilms-in-fluvial-ecosystems
#20
Ute Risse-Buhl, Christine Anlanger, Katalin Kalla, Thomas R Neu, Christian Noss, Andreas Lorke, Markus Weitere
Previous laboratory and on-site experiments have highlighted the importance of hydrodynamics in shaping biofilm composition and architecture. In how far responses to hydrodynamics can be found in natural flows under the complex interplay of environmental factors is still unknown. In this study we investigated the effect of near streambed turbulence in terms of turbulent kinetic energy (TKE) on the composition and architecture of biofilms matured in two mountainous streams differing in dissolved nutrient concentrations...
September 28, 2017: Water Research
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